Mirrored memory configuration method and apparatus, and computer storage medium

ABSTRACT

This application discloses a mirrored memory configuration method and apparatus, and a computer storage medium, and belongs to the field of information processing technologies. The method includes the following: After a computer apparatus is started, if the computer apparatus is currently in an OS state and obtains a mirrored memory establishment request, the computer apparatus may switch from the OS state to a BIOS state through system interruption. Then the computer apparatus configures a mirroring relationship in the BIOS state, and switches to the OS state again after configuring the mirroring relationship, to reconfigure a mirrored memory.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of International Application No.PCT/CN2020/072642, filed on Jan. 17, 2020, which claims priority toChinese Patent Application No. 201910411201.3, filed on May 16, 2019.The disclosures of the aforementioned applications are herebyincorporated by reference in their entireties.

TECHNICAL FIELD

This application relates to the field of information processingtechnologies, and in particular, to a mirrored memory configurationmethod and apparatus, and a computer storage medium.

BACKGROUND

A mirrored memory means the following: Two independent physical memoryspaces are set to be in a mirroring relationship, a virtual mirroredmemory space is configured for the two physical memory spaces, and acorresponding memory address range is allocated to the mirrored memoryspace, so that a computer apparatus can access the mirrored memory spaceby using the memory address range. The two physical memory spaces have asame capacity, and a capacity of the mirrored memory space is the sameas the capacity of one of the physical memory spaces. When the computerapparatus subsequently writes data into the mirrored memory space, thedata is actually simultaneously written into the two physical memoryspaces, to implement hot backup of the data.

In a related technology, a hardware resource is initialized in a processof starting the computer apparatus, for example, a mirrored memory isconfigured. However, the configured mirrored memory cannot be changedafter the computer apparatus is started, and consequently, flexibilityof configuring a mirrored memory is relatively poor in the relatedtechnology.

SUMMARY

This application provides a mirrored memory configuration method andapparatus, and a computer storage medium, to improve flexibility ofconfiguring a mirrored memory. Technical solutions are as follows.

According to a first aspect, a mirrored memory configuration method isprovided. The method is applied to a computer apparatus. The methodincludes: obtaining a mirrored memory establishment request, where themirrored memory establishment request carries a first identifier of afirst physical memory space and a second identifier of a second physicalmemory space; switching a current state of the computer apparatus froman operating system (OS) state to a basic input/output system (BIOS)state through system interruption; configuring the first physical memoryspace and the second physical memory space to be in a mirroringrelationship; obtaining an identifier of a mirrored memory spacecorresponding to the first physical memory space and the second physicalmemory space; switching the current state of the computer apparatus fromthe BIOS state to the OS state; and allocating a memory address space tothe mirrored memory space based on the identifier of the mirrored memoryspace.

In this embodiment of this application, a BIOS and an OS are installedin the computer apparatus. When the BIOS runs, the computer apparatus isin the BIOS state. When the OS runs, the computer apparatus is in the OSstate. After the computer apparatus is started, if the computerapparatus is currently in the OS state and obtains the mirrored memoryestablishment request, the computer apparatus may switch from the OSstate to the BIOS state through system interruption, for example, byusing a system management interrupt (SMI) signal. Then the computerapparatus configures the mirroring relationship in the BIOS state, andswitches to the OS state again after configuring the mirroringrelationship, to reconfigure a mirrored memory. In the entire process,the computer apparatus does not need to be restarted. In this way, in aprocess of reconfiguring the mirrored memory, a service in the OS statedoes not need to be interrupted, thereby improving flexibility ofconfiguring a mirrored memory.

Optionally, before the switching a current state of the computerapparatus from an OS state to a BIOS state through system interruption,the method further includes: performing an offline operation on a memoryaddress range corresponding to the first physical memory space.

In this embodiment of this application, if the first physical memoryspace used to configure a mirrored memory has a corresponding memoryaddress range, that is, the first physical memory space is used by aprocessor, the offline operation needs to be first performed, before themirroring relationship is configured, on the memory address rangecorresponding to the first physical memory space; or if the offlineoperation is not performed, before the mirroring relationship isconfigured, on the memory address range corresponding to the firstphysical memory space, the mirrored memory cannot be successfullyconfigured.

Optionally, the method further includes: receiving a mirrored memoryexpansion request, where the mirrored memory expansion request carriesthe identifier of the mirrored memory space; performing an offlineoperation on the memory address range corresponding to the mirroredmemory space; switching the current state of the computer apparatus fromthe OS state to the BIOS state through system interruption; andterminating the mirroring relationship between the first physical memoryspace and the second physical memory space.

In this embodiment of this application, after the computer apparatus isstarted, if the computer apparatus is currently in the OS state andneeds to re-delete the mirrored memory, the computer apparatus mayswitch to the BIOS state. Then the computer apparatus terminates themirroring relationship in the BIOS state to reconfigure a mirroredmemory. In the entire process, the computer apparatus does not need tobe restarted. In this way, in a process of reconfiguring the mirroredmemory, a service in the OS state does not need to be interrupted,thereby improving flexibility of configuring a mirrored memory.

Optionally, after the terminating the mirroring relationship between thefirst physical memory space and the second physical memory space, themethod further includes: generating a memory report message, where thememory report message carries the identifier of the first physicalmemory space; and allocating the memory address range to the firstphysical memory space based on the memory report message.

After terminating the mirroring relationship, the computer apparatus inthe BIOS state may further report, to the computer apparatus in the OSstate, the first physical memory space obtained after the mirroringrelationship is terminated, so that the computer apparatus in the OSstate can reuse the first physical memory space, thereby furtherimproving flexibility of configuring a mirrored memory.

According to a second aspect, a mirrored memory configuration apparatusis provided, and the mirrored memory configuration apparatus has afunction of implementing behavior of the mirrored memory configurationmethod in the first aspect. The mirrored memory configuration apparatusincludes at least one module, and the at least one module is configuredto implement the mirrored memory configuration method provided in thefirst aspect.

According to a third aspect, a computer apparatus is provided. Astructure of the computer apparatus includes a processor and a memory.The memory is configured to store a program that supports a mirroredmemory configuration apparatus in performing the mirrored memoryconfiguration method provided in the first aspect, and store data usedto implement the mirrored memory configuration method provided in thefirst aspect. The processor is configured to execute the program storedin the memory. An operation apparatus of the computer apparatus mayfurther include a communications bus, and the communications bus isconfigured to establish a connection between the processor and thememory.

According to a fourth aspect, a computer storage medium is provided, andthe computer storage medium stores instructions. When the instructionsrun on a computer, the computer is enabled to perform the mirroredmemory configuration method in the first aspect.

According to a fifth aspect, a computer program product includinginstructions is provided. When the computer program product runs on acomputer, the computer is enabled to perform the mirrored memoryconfiguration method in the first aspect.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of a mirrored memory configuration systemaccording to an embodiment of this application;

FIG. 2 is a flowchart of a mirrored memory configuration methodaccording to an embodiment of this application;

FIG. 3 is a schematic diagram of a mapping relationship between aphysical memory space and a memory address according to an embodiment ofthis application;

FIG. 4 is a schematic diagram of another mapping relationship between aphysical memory space and a memory address according to an embodiment ofthis application;

FIG. 5 is a schematic diagram of another mapping relationship between aphysical memory space and a memory address according to an embodiment ofthis application;

FIG. 6 is a schematic diagram of another mapping relationship between aphysical memory space and a memory address according to an embodiment ofthis application;

FIG. 7 is a flowchart of another mirrored memory configuration methodaccording to an embodiment of this application;

FIG. 8 is a schematic diagram of another mapping relationship between aphysical memory space and a memory address according to an embodiment ofthis application;

FIG. 9 is a schematic diagram of another mapping relationship between aphysical memory space and a memory address according to an embodiment ofthis application;

FIG. 10 is a schematic diagram of another mapping relationship between aphysical memory space and a memory address according to an embodiment ofthis application;

FIG. 11 is a schematic structural diagram of a mirrored memoryconfiguration apparatus according to an embodiment of this application;and

FIG. 12 is a schematic structural diagram of a computer device accordingto an embodiment of this application.

DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS

To make the objectives, technical solutions, and advantages of thisapplication clearer, the following further describes implementations ofthis application in detail with reference to accompanying drawings.

Before a mirrored memory configuration method provided in theembodiments of this application is explained and described, anapplication scenario related to the embodiments of this application isfirst briefly described. Currently, a computer apparatus may support twotypes of mirrored memories. One type is full mirroring, that is, thecomputer apparatus divides all physical memory spaces into two parts,and configures a mirrored memory by using the two parts of physicalmemory spaces. In this case, it is equivalent to that the computerapparatus sacrifices half of the physical memory space to configure themirrored memory. The other type is partial mirroring, that is, thecomputer apparatus uses some physical memory spaces to configure amirrored memory. In this case, the computer apparatus sacrifices onlysome physical memory spaces to configure the mirrored memory, which ismore flexible. The mirrored memory configuration method provided in theembodiments of this application is mainly applied to the second case, sothat the computer apparatus can dynamically adjust a mirrored memory inan OS state.

FIG. 1 is a schematic diagram of a mirrored memory configuration systemaccording to an embodiment of this application. As shown in FIG. 1 , thesystem 100 includes a management system 101 and a computer apparatus102. The management system 101 and the computer apparatus 102communicate with each other in a wired or wireless manner. The computerapparatus may be a device such as a server.

A BIOS and an OS are deployed in the computer apparatus 102. Thecomputer apparatus may run the BIOS, and may also run the OS. In aprocess of starting the computer apparatus, the BIOS first runs toinitialize a hardware resource, for example, configure a mirroredmemory. Then the OS runs to run various services by using theinitialized hardware resource. When the computer apparatus runs theBIOS, it is referred to that the computer apparatus is in a BIOS state.When the computer apparatus runs the OS, it is referred to that thecomputer apparatus is in an OS state. The management system 101 mayinteract with the computer apparatus 102 to manage the computerapparatus 102, for example, enable the computer apparatus 102 toconfigure a mirrored memory in the OS state. A specific implementationis described in the following embodiments, and details are not describedherein first.

In addition, the management system 101 may be a device independent ofthe computer apparatus 102, for example, another computer apparatusindependent of the computer apparatus 102. Alternatively, the managementsystem 101 may be a control chip, and is integrated into the computerapparatus 102. An instruction for implementing a management systemfunction is configured in the control chip. In addition, the managementsystem 101 may provide an access interface to the outside. The accessinterface may be software or a web page, so that an operator can accessthe management system by using the software or the web page, to controlthe computer apparatus.

FIG. 2 is a flowchart of a mirrored memory configuration methodaccording to an embodiment of this application. The method is applied toa computer apparatus. As shown in FIG. 2 , the method includes thefollowing steps.

Step 201: Obtain a mirrored memory establishment request, where themirrored memory establishment request carries a first identifier of afirst physical memory space and a second identifier of a second physicalmemory space.

The mirrored memory establishment request in step 201 may be sent by amanagement system to the computer apparatus, or may be initiated by thecomputer apparatus in an OS state.

When the mirrored memory establishment request in step 201 is sent bythe management system to the computer apparatus, the computer apparatusmay receive, in the following two possible implementations, the mirroredmemory establishment request sent by the management system.

In a first possible implementation, when detecting a mirroring operationinitiation instruction, the management system sends the mirrored memoryestablishment request to the computer apparatus in the OS state. Themirroring operation initiation instruction may be triggered by using apreset operation by an operator corresponding to the management system.In this case, the mirroring operation initiation instruction may carrythe first identifier used for the first physical memory space and thesecond identifier used for the second physical memory space.

In a second possible implementation, when the computer apparatus is inthe OS state and detects a mirroring operation initiation instruction,because a physical memory space is invisible to a processor when thecomputer apparatus is in the OS state, the computer apparatus needs tosend a mirroring operation initiation request to the management system,to indicate the management system to send the mirrored memoryestablishment request based on the mirroring operation initiationrequest. The mirroring operation initiation request carries anidentifier of each of two memory address ranges used to establish amirrored memory. When receiving the mirroring operation initiationrequest, the management system determines a physical memory spacecorresponding to each memory address range, to send, to the computerapparatus, the mirrored memory establishment request carrying the firstidentifier of the first physical memory space and the second identifierof the second physical memory space. It should be noted that in animplementation of this application, the computer apparatus in the OSstate may automatically trigger a mirrored memory establishment processby using a running program or the like, and it is not required that thecomputer apparatus sends the mirrored memory initiation request to themanagement system and that the management system then sends the mirroredmemory establishment request. This is not limited in this application.

In the second possible implementation, the mirroring operationinitiation instruction may further carry an identifier of a memoryaddress range. In this case, the computer apparatus may divide thememory address range into two memory address ranges of a same size, tosend the mirroring operation initiation request to the management systembased on an identifier of each of the two memory address ranges obtainedafter division. In other words, the mirroring operation initiationrequest carries the identifier of each of the two memory address rangesobtained after division.

When the mirrored memory establishment request in step 201 is initiatedby the computer apparatus in the OS state, an implementation in whichthe computer apparatus initiates the mirrored memory establishmentrequest may be as follows: When detecting a mirroring operationinitiation instruction, the computer apparatus in the OS statedetermines each of two memory address ranges used to establish amirrored memory, and then determines, based on each of the two memoryaddress ranges, each of two physical memory spaces used to establish amirrored memory, to initiate the mirrored memory establishment requestcarrying the first identifier of the first physical memory space and thesecond identifier of the second physical memory space.

In this embodiment of this application, the physical memory space may bea physical memory module, for example, may be a dual inline memorymodule (DIMM). The physical memory space may be a physical memory riser,or may be some memory spaces in a physical memory module. This is notspecifically limited herein in this embodiment of this application.

Step 202: Switch a current state of the computer apparatus from an OSstate to a BIOS state through system interruption.

Rights of use of an OS and a BIOS are mutually exclusive to a processorof the computer apparatus. Therefore, in this embodiment of thisapplication, to enable the computer apparatus to adjust a mirroredmemory when continuing to run the OS, the computer apparatus can switchfrom the OS state to the BIOS state through system interruption afterbeing started. In other words, the computer apparatus can switch betweenrunning the OS and running the BIOS.

For example, in a process in which the computer apparatus runs the OS,if a system management interrupt signal is triggered in the computerapparatus, the processor in the computer apparatus stores a currentlyprocessed service (including various services running in the OS), andwakes up another independent operating system BIOS, so that the computerapparatus switches to run the BIOS state. After completing a requiredoperation, the computer apparatus in the BIOS state executes a resume(RSM) instruction. The RSM instruction triggers the computer apparatusto return to the operating system before switching, that is, return tothe OS state, and enables the processor to reload the various servicesthat are previously stored, to resume the various services that aretemporarily interrupted. Therefore, in this embodiment of thisapplication, the system management interrupt signal may be used toimplement switching of the computer apparatus from the OS state to theBIOS state, so that a service running in the OS state is not disabledafter the computer apparatus switches to the BIOS state.

In other words, in this embodiment of this application, the computerapparatus switches between running the OS and running the BIOS in twoswitching modes. One switching mode is switching from the BIOS state tothe OS state by using the system management interrupt signal, to avoidrestarting a computer status to switch from the OS state to the BIOSstate. The other switching mode is switching from the OS state to theBIOS state by actively triggering the RSM instruction.

In addition, an implementation of triggering the system managementinterrupt signal in the computer apparatus may be as follows: Thecomputer apparatus registers a fragment clock in an underlying clockchip. If a current time reaches a specified time point in the fragmentclock, the computer apparatus automatically generates the systemmanagement interrupt signal. In other words, the computer apparatus maytrigger the system management interrupt signal by using a fragment clocktechnology.

Step 203: Configure the first physical memory space and the secondphysical memory space to be in a mirroring relationship, and obtain anidentifier of a mirrored memory space corresponding to the firstphysical memory space and the second physical memory space.

For ease of subsequent description, the mirrored memory spacecorresponding to the first physical memory space and the second physicalmemory space is referred to as a first mirrored memory space. Themirrored memory space is a virtual memory space.

In addition, in this embodiment of this application, to implementinteraction between the OS and the BIOS in the computer apparatus, amessage, a request, or the like generated by the computer apparatus in astate may be placed at a preset storage location. After switching toanother state, the computer apparatus may perform a correspondingoperation based on the message or the request at the storage location.This is equivalent to that the OS and the BIOS in the computer apparatusinteract with each other. Therefore, after obtaining the identifier ofthe first mirrored memory space, the computer apparatus may furthergenerate and store a first memory mirroring message. The first memorymirroring message carries the identifier of the first mirrored memoryspace.

In addition, when the computer apparatus obtains the mirrored memoryestablishment request by using step 201, in the two physical memoryspaces used to establish a mirrored memory, one or two physical memoryspaces may have a corresponding memory address range, that is, the oneor two physical memory spaces are used by the computer apparatus in theOS state; or one or two physical memory spaces may be mirrored memoriesof another physical memory space; or one or two physical memory spacesare physical memory spaces that are re-added in the computer apparatus.Therefore, in this embodiment of this application, when obtaining themirrored memory establishment request, the computer apparatus needs tofirst perform, before performing step 202, an offline (offline)operation on memory address ranges corresponding to the two physicalmemory spaces. The performing the offline operation on the memoryaddress range corresponding to the physical memory space is migratingdata stored in the memory address range, and terminating a mappingrelationship between the physical memory space and the memory addressrange. After terminating the mapping relationship, the computerapparatus cannot access the physical memory space by using the memoryaddress range. Correspondingly, a process of configuring the memoryaddress range for the physical memory space may also be referred to asan online operation.

Therefore, the performing the offline operation on the memory addressranges corresponding to the two physical memory spaces may be separatelydescribed in the following several scenarios.

In a first scenario, one of the two physical memory spaces used toestablish a mirrored memory has a corresponding memory address range. Itis assumed that the first physical memory space has a correspondingmemory address range.

An implementation of performing the offline operation on the memoryaddress range corresponding to the first physical memory space may beswitching the computer apparatus from the current BIOS state to the OSstate. After switching to the OS state, the computer apparatus performsthe offline operation on the memory address range corresponding to thefirst physical memory space, and then switches from the OS state to theBIOS state by using the system management interrupt signal, to configurethe two physical memory spaces to be in the mirroring relationship byusing step 203.

Specifically, if the first physical memory space has the correspondingmemory address range, the computer apparatus may generate and store afirst memory offline request before switching from the BIOS state to theOS state. The first memory offline request carries the identifier of thefirst physical memory space. Then the computer apparatus obtains thefirst memory offline request after switching from the BIOS state to theOS state; performs, based on the first memory offline request, theoffline operation on the memory address range corresponding to the firstphysical memory space; and generates and stores a first offline successmessage. The first offline success message carries the identifier of thefirst physical memory space. Correspondingly, after switching to theBIOS state, the computer apparatus may obtain the first offline successmessage, and determine, based on the identifier of the first physicalmemory space carried in the first offline success message, that thefirst physical memory space is currently unoccupied by the processor.Therefore, the computer apparatus may configure the first physicalmemory space and the second physical memory space to be in the mirroringrelationship.

The foregoing implementation is merely for the first physical memoryspace in the two physical memory spaces used to configure a mirroredmemory. If the two physical memory spaces both meet the first scenario,the memory address ranges corresponding to the two physical memoryspaces both may be put offline in the foregoing implementation, tofacilitate subsequent configuration of a mirrored memory. For example,FIG. 3 is a schematic diagram of a mapping relationship between aphysical memory space and a memory address according to an embodiment ofthis application. There are four physical memory spaces, respectivelymarked as D1, D2, D3, and D4. A memory address range corresponding to D1is m1, a memory address range corresponding to D2 is m2, a memoryaddress range corresponding to D3 is m3, and a memory address rangecorresponding to D4 is m4. Assuming that the mirrored memoryestablishment request carries identifiers of D1 and D2, the computerapparatus needs to first perform the offline operation on m1corresponding to D1 and m2 corresponding to D2.

FIG. 4 is a schematic diagram of another mapping relationship between aphysical memory space and a memory address according to an embodiment ofthis application. As shown in FIG. 4 , after the computer apparatus inthe OS state performs the offline operation on m1 corresponding to D1and m2 corresponding to D2, the memory address ranges m1 and m2 have nocorresponding physical memory space.

FIG. 5 is a schematic diagram of another mapping relationship between aphysical memory space and a memory address according to an embodiment ofthis application. As shown in FIG. 5 , after the computer apparatus inthe OS state performs the offline operation on m1 corresponding to D1and m2 corresponding to D2, the computer apparatus in the BIOS stateregenerates a mirrored memory space D5 for D1 and D2.

In addition, if the mirrored memory establishment request in step 201 isimplemented by sending the mirroring operation initiation request to themanagement system by the computer apparatus in the OS state, beforesending the mirroring operation initiation request to the managementsystem, the computer apparatus may further perform the offline operationon each of the two memory address ranges, so that the computer apparatusin the BIOS state can subsequently directly establish a mirrored memory.

In a second scenario, one or two of the physical memory spaces used toestablish a mirrored memory are mirrored memories of another physicalmemory space.

If the first physical memory space in the two physical memory spaces andthe third physical memory space are in the mirroring relationship witheach other, the first physical memory space and the third physicalmemory space correspond to a second mirrored memory space, and the thirdphysical memory space is a physical memory space other than the firstphysical memory space and the second physical memory space, animplementation in which the computer apparatus performs the offlineoperation on the memory address range corresponding to the firstphysical memory space may be as follows: The computer apparatus switchesfrom the BIOS state to the OS state; and after switching to the OSstate, performs the offline operation on a memory address rangecorresponding to the first mirrored memory space, and then switches fromthe OS state to the BIOS state. After switching to the BIOS state, thecomputer apparatus configures the first physical memory space and thesecond physical memory space to be in the mirroring relationship.

Specifically, before switching from the BIOS state to the OS state, thecomputer apparatus generates and stores a second memory offline request.The second memory offline request carries an identifier of the secondmirrored memory space. Correspondingly, after switching from the BIOSstate to the OS state, the computer apparatus obtains the second memoryoffline request; performs, based on the second memory offline request,the offline operation on a memory address range corresponding to thesecond mirrored memory space; and generates and stores a second offlinesuccess message. The second offline success message carries theidentifier of the second physical memory space. Correspondingly, afterswitching to the BIOS state, the computer apparatus may obtain thesecond offline success message, terminate the mirroring relationshipbetween the first physical memory space and the third physical memoryspace based on the second offline success message, and then configurethe first physical memory space and the second physical memory space tobe in the mirroring relationship.

Similarly, the foregoing implementation is merely for one physicalmemory space. If the two physical memory spaces meet the secondscenario, the memory address ranges corresponding to the two physicalmemory spaces may be put offline in the foregoing implementation, tofacilitate subsequent configuration of a mirrored memory.

In addition, in the second scenario, if the mirrored memoryestablishment request in step 201 is implemented by sending themirroring operation initiation request to the management system by thecomputer apparatus in the OS state, before sending the mirroringoperation initiation request to the management system, the computerapparatus may first perform the offline operation on the memory addressrange corresponding to the second mirrored memory space, so that thecomputer apparatus in the BIOS state can subsequently directly terminatethe mirroring relationship between the first physical memory space andthe second physical memory space, and establish a new mirrored memory.Details are not described herein.

In a third scenario, one or two of the two physical memory spaces usedto establish a mirrored memory are physical memory spaces that arere-added in the computer apparatus.

In the third scenario, a memory address range has not been allocated tothe physical memory space that is re-added in the computer apparatus.Therefore, in the third scenario, the offline operation does not need tobe performed on the physical memory space that is re-added in thecomputer apparatus, and the mirroring relationship is directlyconfigured based on step 203.

It should be noted that for the two physical memory spaces used toestablish a mirrored memory, there may be a case in which the twophysical memory spaces belong to different scenarios. In this case, acorresponding operation only needs to be performed based on acorresponding scenario, and it is only required to ensure that neitherof the two physical memory spaces has a corresponding memory addressrange before the computer apparatus configures the two physical memoryspaces to be in the mirroring relationship.

Step 204: Switch the current state of the computer apparatus from theBIOS state to the OS state.

It can be learned from step 202 that after completing a correspondingoperation in the BIOS state, the computer apparatus may automaticallyexecute the RSM instruction. The RSM instruction triggers the computerapparatus to return to the OS state.

Step 205: Allocate a memory address space to the mirrored memory spacebased on the identifier of the mirrored memory space.

Based on an implementation of step 203, it can be learned that afterobtaining the identifier of the first mirrored memory space, thecomputer apparatus generates and stores the first memory mirroringmessage. Therefore, an implementation of step 205 may be as follows: Thecomputer apparatus obtains the first memory mirroring message, andallocates the memory address range to the first mirrored memory spacebased on the identifier of the first mirrored memory space carried inthe first memory mirroring message.

FIG. 6 is a schematic diagram of another mapping relationship between aphysical memory space and a memory address according to an embodiment ofthis application. As shown in FIG. 6 , after switching to the OS state,the computer apparatus may allocate a memory address space m5 to themirrored memory space D5, and the processor of the computer apparatusmay subsequently simultaneously write data into the two physical memoryspaces D1 and D2 by using m5.

In addition, when the physical memory space is a physical memory riser,if the physical memory riser is no longer used after a memory addressrange corresponding to the physical memory riser is put offline, thephysical memory riser may be powered off. If a new physical memory riseris replaced after the power-off, the new physical memory riser needs tobe powered on to initialize or perform self-test on the memory riser, tofacilitate subsequent configuration of a mirrored memory.

In addition, before configuring two physical memory spaces to be in themirroring relationship, the computer apparatus may further analyzerelated parameters of the two physical memory spaces. After determiningthat the two physical memory spaces meet a standard of a mirroredmemory, the computer apparatus performs the step of configuring the twophysical memory spaces to be in the mirroring relationship, to avoid aconfiguration error. The parameters related to the physical memory spaceinclude parameters such as a capacity and a frequency.

In this embodiment of this application, the computer apparatus mayswitch between running the BIOS and running the OS. Therefore, after thecomputer apparatus is started, if the computer apparatus is currently inthe OS state and needs to reconfigure a mirrored memory, the computerapparatus may switch to the BIOS state by using the system managementinterrupt signal. Then the computer apparatus configures the mirroringrelationship in the BIOS state, and switches to the OS state again afterconfiguring the mirroring relationship, to reconfigure the mirroredmemory. In the entire process, the computer apparatus does not need tobe restarted. In this way, in a process of reconfiguring the mirroredmemory, a service in the OS state does not need to be interrupted,thereby improving flexibility of configuring a mirrored memory.

The computer apparatus may reconfigure a mirrored memory in the OS stateby using step 201 to step 204, and may further cancel a configuredmirrored memory in the OS state in this embodiment of this application.This is explained in the following embodiment.

FIG. 7 is a flowchart of another mirrored memory configuration methodaccording to an embodiment of this application. The method is applied toa computer apparatus. As shown in FIG. 7 , the method includes thefollowing steps.

Step 701: Obtain a mirrored memory expansion request, where the mirroredmemory expansion request carries an identifier of a mirrored memoryspace.

The mirrored memory expansion request may be sent by a management systemto the computer apparatus, or may be initiated by the computer apparatusin an OS state.

When the mirrored memory expansion request in step 701 is sent by themanagement system to the computer apparatus, the computer apparatus mayreceive, in the following two possible implementations, the mirroredmemory expansion request sent by the management system.

In a first possible implementation, when detecting a mirror expansioninstruction, the management system sends the mirrored memory expansionrequest to the computer apparatus in the OS state. The mirror expansioninstruction may be triggered by using a preset operation by an operatorcorresponding to the management system. The mirror expansion instructionmay carry an identifier of each of two physical memory spaces used toexpand a mirror. The management system may determine an identifier of afirst mirrored memory space based on the identifier carried in themirror expansion instruction, to send the mirrored memory expansionrequest to the computer apparatus. Certainly, the mirror expansioninstruction may directly carry an identifier of a mirrored physicalmemory space corresponding to the two physical memory spaces used toexpand a mirror.

In a second possible implementation, when the computer apparatus is inthe OS state and detects a mirror expansion instruction, the computerapparatus forwards the mirror expansion instruction to the managementsystem, to indicate the management system to send the mirrored memoryexpansion request to the computer apparatus. The mirroring operationexpansion instruction carries identifiers of mirrored memory addressranges corresponding to two memory address ranges used for expansion.Similarly, the management system may determine the identifier of thefirst mirrored memory space based on the identifier carried in themirror expansion instruction, to send the mirrored memory expansionrequest to the computer apparatus.

In addition, when the mirrored memory expansion request in step 701 isinitiated by the computer apparatus in the OS state, an implementationin which the computer apparatus initiates the mirrored memory expansionrequest may be as follows: When detecting a mirror expansioninstruction, the computer apparatus in the OS state determines anidentifier of a mirrored memory space for expansion, and then initiatesthe mirrored memory expansion request based on the identifier of themirrored memory space.

Step 702: Perform an offline operation on a memory address rangecorresponding to the mirrored memory space.

Assuming that a mirrored memory to be expanded in step 701 is a firstmirrored memory corresponding to the first physical memory space and thesecond physical memory space in step 201, after performing the offlineoperation on the memory address range corresponding to the firstmirrored memory space based on step 702, the computer apparatusgenerates and stores a third offline success message. The third offlinesuccess message carries the identifier of the first mirrored memoryspace.

Step 703: Switch a current state of the computer apparatus from an OSstate to a BIOS state by using a system management interrupt signal.

For an implementation of step 703, refer to an implementation of step202 in the embodiment in FIG. 2 , and details are not described hereinagain.

Step 704: Terminate a mirroring relationship between a first physicalmemory space and a second physical memory space.

After switching from the current OS state to the BIOS state, thecomputer apparatus may obtain the third offline success message storedin step 702, and may terminate the mirroring relationship between thetwo physical memory spaces based on the identifier of the first mirroredmemory space carried in the third offline success message.

As shown in FIG. 6 , when the computer apparatus is in the OS state, thephysical memory spaces D1 and D2 are in the mirroring relationship witheach other, a mirrored memory space corresponding to D1 and D2 is D5,and D5 corresponds to a memory address range m5. In this case, if theidentifier of the first mirrored memory space carried in the mirroredmemory expansion request in step 701 is D5, as shown in FIG. 8 , thecomputer apparatus in the OS state first performs the offline operationon m5 corresponding to D5. After the offline operation is completed, m5is removed from the memory address range and is no longer used by thecomputer apparatus. After the offline operation shown in FIG. 8 iscompleted, as shown in FIG. 9 , the computer apparatus in the BIOS stateterminates the mirroring relationship between D1 and D2. In this case,virtual D5 corresponding to D1 and D2 also does not exist.

In addition, after terminating the mirroring relationship, the computerapparatus further needs to switch from the BIOS state to the OS state toavoid affecting normal running of a currently performed service. Detailsare not described herein.

In addition, a mirrored memory existing in the OS state may be removedby using step 701 to step 704. After the mirrored memory is removed, amemory address range may be re-allocated to one or two of the physicalmemory spaces by using the following steps 705 and 706, so that thecomputer apparatus in the OS state can reuse one or two of the physicalmemory spaces.

Step 705: Generate a memory report message, where the memory reportmessage carries an identifier of the first physical memory space.

After terminating the mirroring relationship between the two physicalmemory spaces based on step 704, the computer apparatus may generate andstore the memory report message. The memory report message carries theidentifier of the first physical memory space, and then switches fromthe BIOS state to the OS state, to reuse the first physical memory spaceby using the following step 706.

Step 706: Allocate a memory address range to the first physical memoryspace based on the memory report message.

After switching to the OS state, the computer apparatus obtains thememory report message, and allocates the memory address range to thefirst physical memory space based on the memory report message.

Step 705 and step 706 are merely for reuse of the first physical memoryspace in the first physical memory space and the second physical memoryspace, but this does not constitute a limitation on this embodiment ofthis application. For example, after terminating the mirroringrelationship between the first physical memory space and the secondphysical memory space, the computer apparatus may reuse the firstphysical memory space and the second physical memory space by using theforegoing steps 705 and 706.

As shown in FIG. 10 , when the memory report message carries identifiersof D1 and D2, the computer apparatus may reallocate memory addressranges to D1 and D2 after switching from the BIOS state to the OS state.It is assumed that the memory address ranges are m6 and m7. The computerapparatus in the OS state may subsequently reuse D1 and D2.

In addition, after the mirroring relationship between the two physicalmemory spaces is terminated, if it is determined that the two physicalmemory spaces are in a same processor or the two physical memory spacesare a segment of consecutive physical memory spaces, the two physicalmemory spaces may be combined, and then a total memory address range isdirectly allocated to a combined physical memory space. This is notdescribed in detail.

In this embodiment of this application, the computer apparatus mayswitch between running a BIOS and running an OS. Therefore, after thecomputer apparatus is started, if the computer apparatus is currently inthe OS state and needs to terminate a configured mirrored memory, thecomputer apparatus may switch to the BIOS state. Then the computerapparatus terminates the mirroring relationship in the BIOS state, andswitches to the OS state again after terminating the mirroringrelationship. Similarly, the computer apparatus does not need to berestarted in the entire process. In this way, in a process ofreconfiguring the mirrored memory, a service in the OS state does notneed to be interrupted, thereby improving flexibility of configuring amirrored memory.

FIG. 11 is a schematic structural diagram of a mirrored memoryconfiguration apparatus according to an embodiment of this application.As shown in FIG. 11 , the apparatus 1100 includes an obtaining module1110, a configuration module 1120, and an allocation module 1130.

The obtaining module 1110 is configured to obtain a mirrored memoryestablishment request. The mirrored memory establishment request carriesa first identifier of a first physical memory space and a secondidentifier of a second physical memory space.

The configuration module 1120 is configured to: switch a current stateof the computer apparatus from an operating system OS state to a basicinput/output system BIOS state through system interruption; configurethe first physical memory space and the second physical memory space tobe in a mirroring relationship; obtain an identifier of a mirroredmemory space corresponding to the first physical memory space and thesecond physical memory space; and switch the current state of thecomputer apparatus from the BIOS state to the OS state.

The allocation module 1130 is configured to allocate a memory addressspace to the mirrored memory space based on the identifier of themirrored memory space.

The apparatus is further configured to perform the mirrored memoryconfiguration procedures shown in FIG. 2 and FIG. 7 . Specifically, theobtaining module 1110 is configured to perform step 201 in FIG. 2 andstep 701 in FIG. 7 . The configuration module 1120 is configured toperform steps 202 to 204 in FIG. 2 and steps 702 to 705 in FIG. 7 . Theallocation module 1130 is configured to perform step 205 in FIG. 2 andstep 706 in FIG. 7 .

In this embodiment of this application, the computer apparatus mayswitch between running a BIOS and running an OS. Therefore, after thecomputer apparatus is started, if the computer apparatus is currently inthe OS state and needs to reconfigure a mirrored memory, the computerapparatus may switch to the BIOS state. Then the computer apparatusconfigures the mirroring relationship in the BIOS state, and switches tothe OS state again after configuring the mirroring relationship, toreconfigure the mirrored memory. In the entire process, the computerapparatus does not need to be restarted. In this way, in a process ofreconfiguring the mirrored memory, a service in the OS state does notneed to be interrupted, thereby improving flexibility of configuring amirrored memory.

It should be noted that, when the mirrored memory configurationapparatus provided in the foregoing embodiment configures the mirroredmemory, division into the foregoing function modules is used as anexample for illustration. In actual application, the foregoing functionscan be allocated to different function modules and implemented based onrequirements, that is, the inner structure of the device is divided intodifferent function modules to implement all or some of the functionsdescribed above. In addition, the mirrored memory configurationapparatus provided in the foregoing embodiment belongs to a same conceptas the mirrored memory configuration method embodiments. For a specificimplementation process, refer to the method embodiments, and details arenot described herein again.

FIG. 12 is a schematic structural diagram of a computer device accordingto an embodiment of this application. The computer apparatus in thesystem shown in FIG. 1 may be implemented by the computer device shownin FIG. 12 . Referring to FIG. 12 , the computer device includes atleast one processor 1201, a communications bus 1202, a memory 1203, andat least one communications interface 1204.

The processor 1201 may be a general-purpose central processing unit(CPU), an application-specific integrated circuit (ASIC), or one or moreintegrated circuits configured to control program execution of solutionsin this application.

The communications bus 1202 may include a channel for transmittinginformation between the foregoing components.

The memory 1203 may be a read-only memory (ROM) or another type ofstatic storage device that can store static information and aninstruction, or a random access memory (RAM) or another type of dynamicstorage device that can store information and an instruction, or may bean electrically erasable programmable read-only memory (EEPROM), acompact disc read-only memory (CD-ROM) or another compact disc storage,an optical disc storage (including a compact disc, a laser disc, anoptical disc, a digital versatile disc, a Blu-ray disc, and the like), amagnetic disk storage medium or another magnetic storage device, or anyother medium that can be used to carry or store expected program code ina form of an instruction or a data structure and that can be accessed bya computer. However, the memory 1203 is not limited thereto. The memory1203 may exist independently, and is connected to the processor 1201 byusing the communications bus 1202; or the memory 1203 may be integratedwith the processor 1201.

The memory 1203 is configured to store program code for executing thesolutions in this application, and the processor 1201 controls theexecution. The processor 1201 is configured to execute the program codestored in the memory 1203. The program code may include one or moresoftware modules. The computer apparatus in this embodiment of thisapplication may determine, by using the processor 1201 and the one ormore software modules in the program code in the memory 1203, data usedfor application and development.

The communications interface 1204 is any apparatus such as atransceiver, and is configured to communicate with another device orcommunications network, for example, an Ethernet, a radio access network(RAN), or a wireless local area network (wireless local area networks,WLAN).

In specific implementation, in an embodiment, the computer device mayinclude a plurality of processors, for example, the processor 1201 and aprocessor 1205 shown in FIG. 13 . Each of the processors may be asingle-core (single-CPU) processor, or may be a multi-core (multi-CPU)processor. The processor herein may be one or more devices, circuits,and/or processing cores configured to process data (such as a computerprogram instruction).

The computer device may be a general-purpose computer device or adedicated computer device. In specific implementation, the computerdevice may be a desktop, a portable computer, a network server, apersonal digital assistant (PDA), a mobile phone, a tablet computer, awireless terminal device, a communications device, or an embeddeddevice. A type of the computer device is not limited in this embodimentof this application.

All or some of the foregoing embodiments may be implemented by usingsoftware, hardware, firmware, or any combination thereof. When softwareis used to implement the embodiments, the embodiments may be implementedentirely or partially in a form of a computer program product. Thecomputer program product includes one or more computer instructions.When the computer instructions are loaded and executed on a computer,the procedures or functions according to the embodiments of thisapplication are all or partially generated. The computer may be ageneral-purpose computer, a special-purpose computer, a computernetwork, or another programmable apparatus. The computer instructionsmay be stored in a computer-readable storage medium or may betransmitted from a computer-readable storage medium to anothercomputer-readable storage medium. For example, the computer instructionsmay be transmitted from a website, computer, server, or data center toanother website, computer, server, or data center in a wired (forexample, a coaxial cable, an optical fiber, or a digital subscriber line(DSL)) or wireless (for example, infrared, radio, or microwave) manner.The computer-readable storage medium may be any usable medium accessibleby a computer, or a data storage device, such as a server or a datacenter, integrating one or more usable media. The usable medium may be amagnetic medium (for example, a floppy disk, a hard disk, or a magnetictape), an optical medium (for example, a digital versatile disc (DVD), asemiconductor medium (for example, a solid-state drive (SSD)), or thelike.

A person of ordinary skill in the art may understand that all or some ofthe steps of the embodiments may be implemented by hardware or a programinstructing related hardware. The program may be stored in acomputer-readable storage medium. The storage medium may include aread-only memory, a magnetic disk, an optical disc, or the like.

The foregoing descriptions are merely embodiments of this application,but are not intended to limit this application. Any modification,equivalent replacement, or improvement made without departing from thespirit and principle of this application should fall within theprotection scope of this application.

What is claimed is:
 1. A method, comprising: obtaining, by a computer, amirrored memory establishment request, wherein the mirrored memoryestablishment request carries a first identifier of a first physicalmemory space and a second identifier of a second physical memory space;in response to obtaining the mirrored memory establishment request,switching, by the computer, a current state of the computer from anoperating system (OS) state to a basic input/output system (BIOS) statethrough system interruption; configuring, by the computer, the firstphysical memory space and the second physical memory space to be in amirroring relationship; obtaining, by the computer, an identifier of amirrored memory space corresponding to the first physical memory spaceand the second physical memory space; switching, by the computer, thecurrent state of the computer from the BIOS state to the OS state; andallocating, by the computer, a memory address range to the mirroredmemory space based on the identifier of the mirrored memory space. 2.The method according to claim 1, further comprising: obtaining amirrored memory expansion request, wherein the mirrored memory expansionrequest carries the identifier of the mirrored memory space; performinga first offline operation on the memory address range allocated to themirrored memory space; in response to performing the first offlineoperation on the memory address range allocated to the mirrored memoryspace, switching the current state of the computer from the OS state tothe BIOS state through system interruption; and terminating themirroring relationship between the first physical memory space and thesecond physical memory space.
 3. The method according to claim 1,wherein before switching the current state of the computer from the OSstate to the BIOS state through system interruption, the method furthercomprises: performing a second offline operation on a memory addressrange corresponding to the first physical memory space.
 4. The methodaccording to claim 3, wherein after terminating the mirroringrelationship between the first physical memory space and the secondphysical memory space, the method further comprises: generating a memoryreport message, wherein the memory report message carries the identifierof the first physical memory space; and allocating, to the firstphysical memory space, the memory address range corresponding to thefirst physical memory space to based on the memory report message.
 5. Acomputer, comprising: a processor; and a memory storing program codeexecutable by the processor, wherein the program code includesinstructions for: obtaining a mirrored memory establishment request,wherein the mirrored memory establishment request carries a firstidentifier of a first physical memory space and a second identifier of asecond physical memory space; in response to obtaining the mirroredmemory establishment request, switching a current state of the computerfrom an operating system (OS) state to a basic input/output system(BIOS) state through system interruption; configuring the first physicalmemory space and the second physical memory space to be in a mirroringrelationship; obtaining an identifier of a mirrored memory spacecorresponding to the first physical memory space and the second physicalmemory space; switching the current state of the computer from the BIOSstate to the OS state; and allocating a memory address range to themirrored memory space based on the identifier of the mirrored memoryspace.
 6. The computer according to claim 5, wherein the program codefurther includes instructions for: obtaining a mirrored memory expansionrequest, wherein the mirrored memory expansion request carries theidentifier of the mirrored memory space; performing a first offlineoperation on the memory address range allocated to the mirrored memoryspace; in response to performing the offline operation, switching thecurrent state of the computer from the OS state to the BIOS statethrough system interruption; and terminating the mirroring relationshipbetween the first physical memory space and the second physical memoryspace.
 7. The computer according to claim 5, wherein the program codefurther includes instructions for: performing a second offline operationon a memory address range corresponding to the first physical memoryspace.
 8. The computer according to claim 7, wherein the program codefurther includes instructions for: generating a memory report message,wherein the memory report message carries the identifier of the firstphysical memory space; and allocating, to the first physical memoryspace, the memory address range corresponding to the first physicalmemory space based on the memory report message.
 9. A non-transitorycomputer readable storage medium storing a program that is executable bya processor, the program including instructions for: obtaining amirrored memory establishment request, wherein the mirrored memoryestablishment request carries a first identifier of a first physicalmemory space and a second identifier of a second physical memory space;in response to obtaining the mirrored memory establishment request,switching a current state of a computer from an operating system (OS)state to a basic input/output system (BIOS) state through systeminterruption; configuring the first physical memory space and the secondphysical memory space to be in a mirroring relationship; obtaining anidentifier of a mirrored memory space corresponding to the firstphysical memory space and the second physical memory space; switchingthe current state of the computer from the BIOS state to the OS state;and allocating a memory address range to the mirrored memory space basedon the identifier of the mirrored memory space.
 10. The non-transitorycomputer readable storage medium storing the program according to claim9, wherein the program code further includes instructions for: obtaininga mirrored memory expansion request, wherein the mirrored memoryexpansion request carries the identifier of the mirrored memory space;performing a first offline operation on the memory address rangeallocated to the mirrored memory space; in response to performing theoffline operation, switching the current state of the computer from theOS state to the BIOS state through system interruption; and terminatingthe mirroring relationship between the first physical memory space andthe second physical memory space.
 11. The non-transitory computerreadable storage medium storing the program according to claim 10,wherein the program code further includes instructions for: performing asecond offline operation on a memory address range corresponding to thefirst physical memory space.
 12. The non-transitory computer readablestorage medium storing the program according to claim 11, wherein theprogram code further includes instructions for: generating a memoryreport message, wherein the memory report message carries the identifierof the first physical memory space; and allocating, to the firstphysical memory space, the memory address range corresponding to thefirst physical memory space based on the memory report message.